kram
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alecazam
BC6H de/encoder
Maybe this is an interesting candidate for a BC6H de/encoder (MIT license): https://github.com/GPUOpen-Tools/compressonator/tree/master/cmp_compressonatorlib/bc6h
BC6H would be a nice addition in kram.
That one is probably easiest to integrate and it has encode/decode. I heard quality on Compressenator isn't the best, but having the format vs. not is important. NVTT and DXTex also have encoders. This one below is a GPU encoder, but I'm not sure I want to add the GPU dependency to kram yet. There's just too many encoder types to port, and I'd need a gpu abstraction on Metal and Vulkan/DX12. I also still need to feed hdr (fp16/fp32) data down to ASTC HDR and to BC6.
https://knarkowicz.files.wordpress.com/2016/03/knarkowicz_realtime_bc6h_gdc_2016.pdf
The BC6H compressonator sources are in the explicit Xcode projects. I'm also starting to turn on basis for ktx2 thumbnail decode. But I don't have either of these connected in where needed. It took a while to separate BC6H sources.
Compressonator BC6H are now connected up to the bc7enc path for expedience, but it's all LDR right now. ASTC HDR and BC6H need an HDR path where the fp16/fp32 mip data is fed into them. This code is also likely broken in the half <-> float conversions.